Excavation and removal of built-up sediment to restore a detention pond's designed storage, drainage performance and access.
Detention pond sediment removal in San Marcos keeps a basin doing the job it was engineered to do, and in this city that job gets tested hard. The ground here sits over spring-fed riverland and thin upland soils, so storms don't soak in slowly, they sheet off fast and carry fine sediment straight into the nearest basin. A pond that was cut to hold a certain volume a few years back is often holding less than that today simply because of what the water has been dropping into it.
You see it in specific ways once you walk the berm. Slow drawdown after a rain event is usually the first sign, because the storage volume that used to drain in a day now takes three. A forebay packed in with silt is another, especially near newer construction in Blanco Gardens or Willow Creek where disturbed ground upstream sheds heavier loads. Bare, eroded slopes and volunteer trees working their roots into an embankment both show up on older ponds that have gone a long stretch without attention, and a partially blocked outlet structure is common wherever leaf litter and grit have had years to settle.
Working with Corral Bros on this scope starts with a straightforward site walk and a sediment depth check, so the property manager or board gets a clear picture of what's actually in the basin before any machine moves. We excavate to the design grade, clean out the forebay and outlet, and haul the spoils offsite. You get a pond that drains the way it was built to, and a scope of work that stayed on the plan from the start.
We're a local, family-built company that treats your San Marcos property like our own, tidy crews, clear pricing, and detention pond sediment removal that holds up to Hays County conditions. Available as a one-time project or part of an ongoing plan.
We schedule a free on-site visit, usually within 48 hours of your call, and walk the pond with you or your site contact. We check sediment depth, look at the forebay and outlet, and note any slope or access issues before putting together a scope. You get a specific plan for your basin, not a generic quote based on pond size alone.
It depends on the watershed above it, but many basins in Hays County need attention every few years rather than on a fixed schedule. Newer developments near active construction silt up faster because disturbed ground upstream sheds more sediment in every storm. The honest answer comes from a depth check against the as-built grade, not a calendar date.
Slow drawdown after rain, standing water where there shouldn't be any, and a visibly shallow forebay are the usual triggers. If sediment keeps building, the pond loses storage volume it was engineered to hold, which can push water higher on the embankment during a heavy event. Catching it early keeps the fix a cleanout instead of a bigger repair.
We coordinate access and timing with the property manager or association contact ahead of the work, which matters in university-town rentals, river properties, and active-adult communities where parking and foot traffic differ a lot. Equipment generally stays within the pond and access easement, and we plan hauling routes to avoid blocking resident or tenant parking during the job.
The thin upland soils and spring-fed riverland around San Marcos mean rainfall runs off fast instead of soaking in, so basins here tend to collect sediment in bursts during heavy storms rather than gradually. That can mean a forebay fills in faster than the rest of the pond, which is one reason we check sediment depth at several points rather than relying on one reading.
The main factors are how much sediment has to come out, how far equipment has to travel to reach the pond, and what the offsite hauling and disposal distance looks like. Embankment condition, volunteer tree removal, and outlet structure cleanout can add scope too. The on-site estimate accounts for all of it before work starts, so there are no surprises mid-job.
Free, no-pressure estimate from a local crew. Call (737) 404-9343 or request a quote online.
